#include<iostream>
using namespace std;
int main(){
  int a,b;
  char c;
  cin>>a>>b>>c;
  if(c=='/'){
    if(b==0)cout<<"Divided by zero!";
    else cout<<a/b;
  }
  else if(c=='*')cout<<a*b;
  else if(c=='+')cout<<a+b;
  else if(c=='-')cout<<a-b;
  else cout<<"Invalid operator!";
}